Storage stalwart Western Digital announced that it's expanding its enterprise-class storage line with the release of new WD RE SAS and WD RE SATA hard drives in capacities up to 4TB, matching the largest capacity current available in the market. If that's too much storage, the new SAS drives will also ship in 1TB, 2TB, and 3TB capacities, and the same with the SATA drives, minus the 1TB model.